javascript - Java Script, Need help finding my error -

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<script type="text/javascript">  var score = prompt("enter score. grade must between 100-0.");   if ( score>==90 )      {         document.write ( "your grade a." )     } else if ( score <89>==80 )     {         document.write ( "your grade b." )     } else if ( score <79>==70 )     {         document.write ( "your grade c.")     } else if ( score <69>==60 )      {         document.write ( "your grade d.")     } else if ( score <59>==0 )     {         document.write ( "your grade f")    }  }//end if </script>

should 

if ( score>==90 )   {     document.write ( "your grade a." )  } else if ( score >==80 ) {     document.write ( "your grade b." ) }  else if ( score >==70 ) {     document.write ( "your grade c.") } else if ( score >==60 )   {     document.write ( "your grade d.")  } else if ( score >==0 ) {     document.write ( "your grade f")  }

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